CN110713311A - Process for denitrifying and desalting ultrahigh-concentration nitrogen-containing and salt-containing wastewater - Google Patents
Process for denitrifying and desalting ultrahigh-concentration nitrogen-containing and salt-containing wastewater Download PDFInfo
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Abstract
The invention relates to the field of wastewater treatment, in particular to a denitrification and desalination treatment process for wastewater containing nitrogen and salt with ultrahigh concentration.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to the field of wastewater treatment in the steel industry.
Background
In order to protect the environment, prevent and control pollution and promote the progress of the steel industry and pollution treatment technology, the emission control index of total nitrogen is less than 15mg/l, and the emission index of ammonia nitrogen is improved from 15mg/l to the limit value below 5 mg/l.
In areas where the density of the development of the homeland is high, the environmental bearing capacity begins to weaken, or the environmental capacity is small, the ecological environment is fragile, and serious environmental pollution problems easily occur, and special protection measures need to be taken, the pollutant discharge behaviors of enterprises are controlled in a qualified mode.
Shanxi is used as a province with serious shortage of water resources, and the industry mainly uses heavy industries with large water consumption such as coal, steel and the like, so that the total nitrogen concentration in the water after wastewater treatment is required to be less than 15 mg/l.
The steel industry in China takes more than 30 hundred million tons of water every year, belongs to the high water consumption industry, particularly enterprises for producing stainless steel, has long production flow, higher requirements on the required water quantity and water quality, and complicated components of wastewater produced in the production process, and causes the wastewater produced in a stainless steel production plant to contain high-concentration total nitrogen with the total nitrogen concentration of 500-1500mg/l because a large amount of nitric acid is used in the stainless steel pickling process.
At present, the total nitrogen content in the conventional domestic sewage and industrial wastewater is generally 40-60mg/l, and the conventional A is used2The total nitrogen concentration in the wastewater from stainless steel production is ultrahigh, and the conventional treatment process cannot meet the requirement of environmental protection.
Disclosure of Invention
The invention aims to solve the technical problem of how to provide a process suitable for large-scale treatment of the wastewater in the steel industry.
The technical scheme adopted by the invention is as follows: the nitrogen and salt removing treatment process for the ultrahigh-concentration nitrogen-containing and salt-containing wastewater comprises the following steps
Step one, inputting the ultrahigh-concentration nitrogen-containing salt-containing wastewater to be treated into a pH adjusting tank, adjusting the pH value to 7.5 +/-0.2 by adding hydrochloric acid or sodium hydroxide, and inputting the wastewater into a denitrification wastewater adjusting tank;
step two, firstly carrying out aeration treatment in a denitrification wastewater adjusting tank, then keeping the temperature at 25-30 ℃ for natural precipitation, discharging the precipitate to a sludge collection position through a sewage pump for pressing and packaging treatment, and automatically flowing the wastewater subjected to natural precipitation into a denitrification unit;
step three, firstly measuring the nitrogen content of the wastewater in the denitrification unit, then adding a carbon source and a phosphorus source for fully mixing, then entering the denitrification unit, strictly controlling the pH value of the denitrification unit to be 7.5 +/-1 and the dissolved oxygen DO to be below 0.5ppm, carrying out microbial digestion biochemical treatment, and carrying out NO biochemical treatment3-Conversion to N2Decomposing a carbon source to generate carbonate ions, combining the carbonate ions with calcium ions in water to generate calcium carbonate precipitates, discharging the precipitates to a sludge collection position through a sewage pump for pressing and packaging treatment, feeding the treated wastewater into an aerobic reaction unit, reducing Chemical Oxygen Demand (COD) in the water, converting part of ammonia nitrogen in the water into nitrate nitrogen, then precipitating, feeding the wastewater into a hardness removal reaction unit, measuring the nitrogen content of the precipitates, discharging the precipitates to the sludge collection position through the sewage pump for pressing and packaging treatment if the nitrogen content of the precipitates meets a discharge standard, and discharging the precipitates to a pin removal unit through the sewage pump for pin removal treatment again if the nitrogen content of the precipitates does not meet the discharge standard; and removing more than 95% of nitrogen and more than 35% of salt in the wastewater after the third step.
Fourthly, monitoring the conductivity of the hardness removal reaction unit, adding a hardness reducing agent sodium carbonate according to the denitrification proportion, then precipitating again, wherein the water quality after hardness precipitation meets the requirement of double-membrane UF + RO treatment, and discharging the precipitate to a sludge collection position through a sewage discharge pump for pressing and packaging treatment;
and step five, enabling the wastewater passing through the hardness removal reaction unit to enter a multi-media filter UF + RO for desalination treatment, wherein the desalinated water can be used for industrial water with higher water quality requirement.
The PH adjusting ponds have two, adjust the PH value to 7.5-7.8 in first PH adjusting pond, adjust the PH value to 7.5 0.2 in the second PH adjusting pond, all install agitating unit in every PH adjusting pond, keep apart through the baffle between first PH adjusting pond and the second PH adjusting pond, the waste water after first PH adjusting pond adjustment is from flowing into second PH adjusting pond, waste water after the second PH adjusting pond is handled passes through the water pump and carries denitrogenation waste water equalizing basin.
The invention has the beneficial effects that: the invention provides a set of new and complete wastewater treatment and recycling process for the treatment of high-concentration nitrogen-containing and salt-containing wastewater, the concentration range of the nitrate and nitrogen-containing wastewater treated by the invention can reach 1500mg/l for 500 plus materials, and the range of the salt content (TDS) can reach 8000mg/l for 5000 plus materials. The method can reduce the total nitrogen concentration in the wastewater from more than 1000mg/l to 15mg/l, and simultaneously can reduce the salt content in the water, the TDS in the water can be reduced from 5000mg/l to about 3000mg/l, the water with reduced salt content can be used for common industrial water, and then deep desalination treatment is carried out, so that the TDS in the water can be reduced to below 50mg/l, and the method can be used for industrial water with higher water quality requirement.
Drawings
FIG. 1 is a schematic diagram of the construction of a pH adjustment tank according to the present invention;
FIG. 2 is a schematic view of a parallel structure of a denitrification wastewater adjusting tank according to the invention;
FIG. 3 is a schematic structural view of the release unit of the present invention;
FIG. 4 is a schematic structural diagram of an aerobic reaction unit according to the present invention;
FIG. 5 is a schematic view of the first stage sludge discharge configuration of the present invention;
FIG. 6 is a schematic diagram of the structure of the secondary sludge of the present invention;
FIG. 7 is a schematic diagram of the present invention for adding a hardness-reducing agent;
FIG. 8 is a schematic representation of a filtered water tank of the present invention;
the device comprises a stirring device 1, a partition plate 2, a PH detection device 3, a pin removal tank 4, an aerobic reaction tank 5 and a water tank.
Detailed Description
As shown in figures 1-7, the wastewater containing nitrogen and salt with ultrahigh concentration to be treated enters a PH adjusting tank, is lifted by a lift pump after the PH is accurately adjusted to enter a denitrification wastewater adjusting tank, is aerated in the adjusting tank to carry out wastewater homogenization treatment, can be heated by steam for 25-30 times if entering the winter, and is provided with a sludge discharge pump, so that the bottom sludge of the adjusting tank can be discharged without influencing subsequent treatment units. 7.5-8,7.4-7.7
The denitrified waste water regulating tank automatically flows into the denitrified unit, and the waste water enters the denitrified unit through monitoring the water quantity, the nitrogen content and the like and calculation by an automatic control programMixing with carbon source (methanol, the mass ratio of methanol to nitrogen is 1: 3) and phosphorus source (phosphoric acid, sodium phosphate and sodium dihydrogen phosphate) at 1ppm or less, introducing the mixed wastewater into a denitration unit, performing seven-row eight-stage microbial digestion biochemical treatment on the wastewater in the denitration unit under the conditions that the pH is strictly controlled to be 7.5 and the dissolved oxygen DO is below 0.5ppm, and treating NO3-Conversion to N2Thereby achieving the removal of NO3-The purpose of (1). In the treatment unit, carbonate is generated after the carbon source is decomposed, calcium ions in water are combined to generate calcium carbonate precipitate, and part of the calcium ions are removed through sludge discharge of the primary precipitation unit.
The effluent of the denitrification unit enters an aerobic reaction unit, the Chemical Oxygen Demand (COD) in the water is reduced through three rows and five sections of aerobic biochemical reactions in the aerobic reaction unit, partial ammonia nitrogen in the water is converted into nitrate nitrogen, and partial nitrate nitrogen flows back to enter the denitrification unit again through the sludge backflow of the primary sedimentation unit to be removed.
And (3) the effluent of the aerobic reaction unit enters a primary precipitation unit, sludge and treated water are separated in the primary precipitation unit, the sludge flows back to the denitration unit according to a set automatic control program, and partial sludge is calculated according to the sludge concentration by the automatic control program and then is discharged.
Through the treatment of the units, more than 95% of nitrate nitrogen and ammonia nitrogen in the water are removed, and part of calcium ions are removed, so that the salt content in the water can be reduced by about 35%.
The water after the primary precipitation treatment enters a hardness removal reaction unit, a hardness reducing agent sodium carbonate is added after the conductivity is monitored and the denitrification ratio is set by a program, the water enters a secondary precipitation unit, and the water quality after the hardness precipitation meets the requirement of double-membrane UF + RO treatment.
And (3) enabling the water subjected to secondary precipitation to enter a multi-media filter, carrying out desalination treatment on UF + RO, enabling the desalinated water to be used as industrial water with higher water quality requirement, and discharging the concentrated brine into a next-level sewage treatment unit for treatment.
In the process of wastewater treatment, the method can effectively reduce calcium ions in water, precipitate the calcium ions, and convert nitrate nitrogen and ammonia nitrogen in the water into nitrogen to be discharged into the atmosphere, thereby reducing the salt content in the water.
After calcium ions in water are reduced by the treatment unit, the requirement of inlet water quality of the reverse osmosis membrane is met, and then salt content in the water is further reduced by the reverse osmosis membrane, so that the industrial demineralized water standard that the salt content in the water is less than 50mg/l is met.
The denitration unit adopts 7-row 8-section efficient denitration design, and is relatively commonly used A2The denitration units in sewage treatment processes such as the treatment of/O, SBR and the like not only improve the denitration efficiency, but also save the occupied area. The technology divides the design of the anoxic tank into 7 rows and 8 sections, can concentrate the advantages of carbon sources, total nitrogen in sewage and returned sludge in the first 3 sections, utilizes the hydraulic power and the water flow direction, increases the contact time of the activated sludge and the total nitrogen in the sewage, improves the biochemical decomposition efficiency of the activated sludge on the nitrate nitrogen in the first 3 sections, finishes the degradation of the nitrate nitrogen in the first 6 sections, and ensures that the degradation of the nitrate nitrogen reaches the standard by taking the last two sections as a guarantee means.
Claims (2)
1. The nitrogen and salt-containing wastewater denitrification and desalination treatment process with ultrahigh concentration is characterized in that: the method comprises the following steps
Step one, inputting the ultrahigh-concentration nitrogen-containing salt-containing wastewater to be treated into a pH adjusting tank, adjusting the pH value to 7.5 +/-0.2 by adding hydrochloric acid or sodium hydroxide, and inputting the wastewater into a denitrification wastewater adjusting tank;
step two, firstly carrying out aeration treatment in a denitrification wastewater adjusting tank, then keeping the temperature at 25-30 ℃ for natural precipitation, discharging the precipitate to a sludge collection position through a sewage pump for pressing and packaging treatment, and automatically flowing the wastewater subjected to natural precipitation into a denitrification unit;
step three, firstly measuring the nitrogen content of the wastewater in the denitrification unit, then adding a carbon source and a phosphorus source for fully mixing, then entering the denitrification unit, strictly controlling the pH value of the denitrification unit to be 7.5 +/-1 and the dissolved oxygen DO to be below 0.5ppm, carrying out microbial digestion biochemical treatment, and carrying out NO biochemical treatment3-Conversion to N2Decomposing carbon source to generate carbonate ion, combining with calcium ion in water to generate calcium carbonate precipitate, discharging the precipitate to sludge collection position through sewage pump, and pressingPacking, wherein the treated wastewater enters an aerobic reaction unit, reduces Chemical Oxygen Demand (COD) in the water and converts part of ammonia nitrogen in the water into nitrate nitrogen, then the nitrate nitrogen is precipitated, the wastewater enters a de-hardening reaction unit, simultaneously the nitrogen content of the precipitate is measured, if the nitrogen content of the precipitate meets the discharge standard, the precipitate is discharged to a sludge collection part through a sewage pump to be pressed and packed, and if the nitrogen content of the precipitate does not meet the discharge standard, the precipitate is discharged to a de-pinning unit through the sewage pump to be de-pinned again; removing more than 95% of nitrogen and more than 35% of salt in the wastewater after the third step;
fourthly, monitoring the conductivity of the hardness removal reaction unit, adding a hardness reducing agent sodium carbonate according to the denitrification proportion, then precipitating again, wherein the water quality after hardness precipitation meets the requirement of double-membrane UF + RO treatment, and discharging the precipitate to a sludge collection position through a sewage discharge pump for pressing and packaging treatment;
and step five, enabling the wastewater passing through the hardness removal reaction unit to enter a multi-media filter UF + RO for desalination treatment, wherein the desalinated water can be used for industrial water with higher water quality requirement.
2. The denitrification and desalination treatment process for the ultrahigh-concentration nitrogen-containing and salt-containing wastewater according to claim 1, characterized in that: the PH adjusting ponds have two, adjust the PH value to 7.5-7.8 in first PH adjusting pond, adjust the PH value to 7.5 0.2 in the second PH adjusting pond, all install agitating unit in every PH adjusting pond, keep apart through the baffle between first PH adjusting pond and the second PH adjusting pond, the waste water after first PH adjusting pond adjustment is from flowing into second PH adjusting pond, waste water after the second PH adjusting pond is handled passes through the water pump and carries denitrogenation waste water equalizing basin.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111689655A (en) * | 2020-07-02 | 2020-09-22 | 山西太钢不锈钢股份有限公司 | Full-automatic intelligent control system for treating nitrogen-containing wastewater |
| CN115093049A (en) * | 2022-06-25 | 2022-09-23 | 广西七彩环境科技有限公司 | Method for treating ultra-high phosphorus sewage |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102276122A (en) * | 2011-07-27 | 2011-12-14 | 北京京诚科林环保科技有限公司 | Denitrification process of stainless steel cold rolling mixed acid wastewater |
| CN104058548A (en) * | 2013-03-22 | 2014-09-24 | 宝山钢铁股份有限公司 | Denitrification, desalination and recycling process of stainless steel cold rolling acidic waste water |
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- 2019-09-04 CN CN201910831514.4A patent/CN110713311A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102276122A (en) * | 2011-07-27 | 2011-12-14 | 北京京诚科林环保科技有限公司 | Denitrification process of stainless steel cold rolling mixed acid wastewater |
| CN104058548A (en) * | 2013-03-22 | 2014-09-24 | 宝山钢铁股份有限公司 | Denitrification, desalination and recycling process of stainless steel cold rolling acidic waste water |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111689655A (en) * | 2020-07-02 | 2020-09-22 | 山西太钢不锈钢股份有限公司 | Full-automatic intelligent control system for treating nitrogen-containing wastewater |
| CN115093049A (en) * | 2022-06-25 | 2022-09-23 | 广西七彩环境科技有限公司 | Method for treating ultra-high phosphorus sewage |
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